If 10 gm of V2O5 is dissolved in acid and is reduced to V2+ by zinc metal, how many moles of I2 could be reduced by the resulting solution if it is further oxidized to VO2+ ions?

[Assume no change in state of Zn2+ions] (V = 51, O =16, I = 127) :

1. 0.11 mole of I2 2. 0.22 mole of I2
3. 0.055 mole of I2 4. 0.44 mole of I2

Subtopic:  Balancing of Equations |
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0.70 g of mixture (NH4)2 SO4 was boiled with 100 mL of 0.2 N NaOH solution till all the NH3(g) evolved and get dissolved in solution itself. The remaining solution was diluted to 250 mL. 25 mL of this solution was neutralized using 10 mL of a 0.1 N H2SO4 solution. The percentage purity of the (NH4)2 SO sample is

(1) 94.3

(2) 50.8

(3) 47.4

(4) 79.8

Subtopic:  Redox Titration & Type of Redox |
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A mixed solution of potassium hydroxide and sodium carbonate required 15 mL. of an N/20 HCI solution when titrated with phenolphthalein as an indicator. But the same amount of the solution when titrated with methyl orange as an indicator required 25 mL of the same acid. The amount of KOH present in the solution is

(1) 0.014g

(2) 0.14g

(3) 0.028g

(4) 1.4 g

Subtopic:  Equivalent Weight |
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One gm. of a metal carbonate gave 0.56 gm. of its oxide on heating. The equivalent mass of the metal is

1. 40

2. 30

3. 20

4. 10

Subtopic:  Equivalent Weight |
 66%
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The pair of compounds that can exist together is

1. FeCl3, SnCl2             

2. HgCl2, SnCl2

3. FeCl2, SnCl2             

4. FeCl3, KI

Subtopic:  Introduction to Redox and Oxidation Number | Oxidizing & Reducing Agents |
NEET - 2014
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In which of the following compounds, nitrogen exhibits highest oxidation state?

1. N2H                

2. NH3

3. N3H                   

4. NH2OH

Subtopic:  Oxidizing & Reducing Agents |
 54%
From NCERT
NEET - 2012
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A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the

reaction which element undergoes a maximum change in the oxidation number?

1. S

2. H

3. Cl

4. C

Subtopic:  Oxidizing & Reducing Agents |
 55%
NEET - 2012
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The oxidation states of P in H4P2O5, H4P2O6, H4P2O7, are respectively -

1. +3, +5, +4 2. +5, +3, +4
3. +5, +4, +3 4. +3, +4, +5
Subtopic:  Oxidizing & Reducing Agents |
 85%
From NCERT
NEET - 2010
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Oxidation numbers of P in PO43-, of S in SO42- and that of Cr in Cr2O72- are respectively,

1. +5, +6 and +6                     

2. +3, +6 and +5

3. +5, +3 and +6                     

4. -3, +6 and +6

Subtopic:  Balancing of Equations |
 86%
From NCERT
NEET - 2009
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The number of moles of MnO-4 required to oxidise one mole of ferrous oxalate completely in an acidic medium is-

1. 0.6 mole

2. 0.4 mole

3. 7.5 moles

4. 0.2 mole

Subtopic:  Oxidizing & Reducing Agents | Redox Titration & Type of Redox |
From NCERT
NEET - 2008
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Links
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